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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "prmon.h"
#include "nsIEventQueue.h"
#include "nsPIEventQueueChain.h"
class nsEventQueueImpl : public nsIEventQueue,
public nsPIEventQueueChain
{
public:
nsEventQueueImpl();
NS_DECL_ISUPPORTS
NS_DECL_NSIEVENTTARGET
NS_DECL_NSIEVENTQUEUE
// Helpers
static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
static const nsCID& CID() { static nsCID cid = NS_EVENTQUEUE_CID; return cid; }
// nsPIEventQueueChain interface
NS_IMETHOD AppendQueue(nsIEventQueue *aQueue);
NS_IMETHOD Unlink();
NS_IMETHOD GetYoungest(nsIEventQueue **aQueue);
NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue);
NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue);
NS_IMETHOD GetYounger(nsIEventQueue **aQueue);
NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue);
NS_IMETHOD GetElder(nsIEventQueue **aQueue);
private:
~nsEventQueueImpl();
PLEventQueue *mEventQueue;
PRBool mAcceptingEvents, // accept new events or pass them on?
mCouldHaveEvents; // accepting new ones, or still have old ones?
nsCOMPtr<nsPIEventQueueChain> mElderQueue; // younger can hold on to elder
nsPIEventQueueChain *mYoungerQueue; // but elder can't hold on to younger
void NotifyObservers(const char *aTopic);
void CheckForDeactivation() {
if (mCouldHaveEvents && !mAcceptingEvents && !PL_EventAvailable(mEventQueue)) {
if (PL_IsQueueOnCurrentThread(mEventQueue)) {
mCouldHaveEvents = PR_FALSE;
NS_RELEASE_THIS(); // balance ADDREF from the constructor
} else
NS_ERROR("CheckForDeactivation called from wrong thread!");
}
}
};
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